While it is possible the latest nvidia drivers do support the 4050 cards, since they are slated for release soon I would really doubt the drivers are available yet to support them in fedora (or linux in general)
It is commonly understood that one should wait for some time after new hardware is released for the drivers to filter out in support of those devices.
The general rule of thumb is wait up to a year for full linux support, though since the nvidia drivers are proprietary they often are updated within 1 to 2 months after the hardware release.
A quick search at nvidia.com shows the RTX 4000 series drivers to be version 525.89.2 to be released 2/8/2023 and the latest driver released at rpmfusion is 525.85.5
This is the biggest issue I have with Linux. I really prefer it as an operating environment (even though I was a Microsoft insider in a previous life). I know it’s not the fault of Linux distro maintainers, and I understand why Linus reacted the way he famously did to Nvidia, but it’s really difficult to see Linux gaining the widespread adoption that most of us in the community want for it when there’s so much difficulty getting graphics to work generally.
I’ve actually had very positive experiences with Linux distros on very up-to-date hardware, except for GPUs. I’ve been advised to go for older tech, and admittedly Debian 10 is working brilliantly on a more than a decade-old MacBook Pro, but Linux is also working well on an Alder Lake machine and a new AMD 7950X build. I’ve even managed to get previous generation GPUs operational finally (still not on the Alder Lake laptop though - I’m convinced it’s an issue of the Dell security setup somehow). Meanwhile, Windows just works with whatever GPU I stick in a PCIe slot.
As far as I can tell all the 3000 series GPUs are fully supported.
Even nvidia is saying the drivers for the 4000 series were only to be released 2 days ago. No matter what else intervenes, it will take some time for the distributors (rpmfusion, etc.) to download those drivers, package them, and put them through testing before releasing them.
You could go directly to nvidia and download + install their version. That will leave you stuck with manually reinstalling with every new kernel update if you do not have the patience to wait for the normal rpmfusion release process for the updated nvidia drivers.
I’ll let it sit for a while. It’s not like I’m in a massive rush, really. I just wanted to get this new machine setup and then leave it. I can also hope for prices to come down on the new Nvidia GPUs in the meantime (fat chance).
I did try that method when I was trying to get the laptop 3050Ti working. I got 5 allegedly fatal errors during the dkms phase and I think a black screen when I powered through. It wasn’t an encouraging experience. And at the rate Fedora updates I don’t fancy having to go through the Nvidia driver reinstallation rigmarole on a frequent basis thanks! For now rpmfusion is working with my 3050. That was supposed to be a stop-gap GPU because of the stupid prices in 2020-2021, but now it looks like we’re stuck with stupid GPU prices forever. 3080 Ti prices are nuts! Hence why I thought I’d go for a 4070Ti. Maybe by the time the 7.0 build of the kernel rolls around?
RPMFusion doesn’t modify the packaged drivers in any way that would affect specific cards. So if Nvidia says it’s supported, it should be—or it’s Nvidia’s problem.